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Technology and Human Response Owl Ridge Chapter 10 Technology and Human Response to Environmental Change at the Pleistocene- Holocene Boundary in Eastern Beringia: A View from Owl Ridge, Central Alaska Angela K. Gore and Kelly E. Graf Introduction Archaeological investigations in Alaska are significant in providing information about initial human occupation of Beringia, the entry point from an Asian homeland for first Americans (Meltzer 2004; Goebel et al. 2008). Recent research in eastern Beringia has revealed a complex record of terminal Pleistocene-aged sites important to understanding how the Americans were settled. Shortly after initial colonization of eastern Beringia, so far identified at the Swan Point site and dated to ~14,100 cal- endar years before present (cal. BP) (Potter et al. 2014a), the Beringian record became highly variable. One case of this variability comes from central Alaska and is represented by two technological complexes, Nenana and Denali (Powers and Hoffecker 1989; Hoffecker 2001; Graf and Bigelow 2011; Graf et al. 2015). We explore this variability in central Alaska by examining how early and later inhabitants of the Owl Ridge site organized their technologies in response to Late Pleistocene and early Holocene environmental fluctuations. We use the established terms, Nenana complex and Denali complex, heuristically, not in an attempt to define human groups or archaeological traditions but to classify observed technolo- gies that represent technological strategies humans adopted while responding to past environmental change. We focus specifically on lithic raw material (or tool- stone) procurement and selection behaviors to explain how humans responded to climate change during this interval while arriving in central Alaska and subsequently settling in the region. A.K. Gore (*) • K.E. Graf Center for the Study of the First Americans, Department of Anthropology, Texas A&M University, College Station, TX, USA e-mail: [email protected]; [email protected] © Springer International Publishing AG 2018 E. Robinson, F. Sellet (eds.), Lithic Technological Organization and Paleoenvironmental Change, Studies in Human Ecology and Adaptation 9, DOI 10.1007/978-3-319-64407-3_10 A.K. Gore and K.E. Graf Background Archaeological Context As mentioned above, the earliest unequivocal evidence of humans in eastern Beringia comes from Swan Point, located in the middle Tanana Valley 100 km southeast of Fairbanks, Alaska, dating to 14,100 cal. BP, and containing a Siberian late Upper Paleolithic technology based on wedge-shaped microblade-core produc- tion (Gomez Coutouly 2011, 2012; Holmes 2011). Following this, humans contin- ued occupying central Alaska through the Late Pleistocene and early Holocene (Potter 2008; Graf and Bigelow 2011), but toolkits changed. The regional pattern of technological variability that emerged after initial exploration has led some to rec- ognize a Nenana complex chronologically and technologically distinct from the Denali complex first identified by West (1967). In this view, Nenana complex assemblages, found at several multicomponent sites in the Nenana and Tanana val- leys, date to 13,500–13,000 cal. BP and contain unifacial tools (end scrapers, retouched blades and flakes, gravers, and wedges), diagnostic Chindadn-type bifa- cial points that are teardrop-shaped or triangular-shaped and sometimes only mar- ginally retouched, other bifaces, and cobble tools (Powers and Hoffecker 1989; Hoffecker et al. 1993; Goebel et al. 1991; Yesner 1996, 2001; Hoffecker 2001; Graf and Goebel 2009; Graf and Bigelow 2011; Graf et al. 2015). Similar technologies dating to the same period of time have even been reported from the Ushki Lake and Berelekh sites in western Beringia (Dikov 1977; Mochanov 1977; Goebel et al. 2003, 2010; Pitulko 2011). In contrast, Denali complex assemblages, many from the same multicomponent sites with temporally and stratigraphically distinct lower Nenana complex compo- nents, date to 12,600–10,000 cal. BP and contain toolkits with lanceolate and concave- based bifacial points, unifacial tools (side scrapers and retouched flakes), as well as burin and microblade technologies. In Nenana Valley sites, lanceolate and concave-based points, burins, and microblade technologies are absent from older Nenana complex components (i.e., Owl Ridge, Dry Creek, Walker Road, Moose Creek) (Powers and Hoffecker 1989; Pearson 1999; Hoffecker 2001; Graf and Bigelow 2011; Graf et al. 2015). During recent investigations of the Teklanika West site, however, a lanceolate point was found in what appears to be a com- pressed stratigraphic context and palimpsest situation, where two horizontally over- lapping artifact zones (components 1 and 2) were found in the same sedimentological unit unseparated by sterile deposits and associated with faunal remains dating to 13,100–9700 cal. BP. Coffman (2011: 106) concluded that the lanceolate point could be associated with component 1 but acknowledged it could be intrusive from component 2. Mostly because a very early microblade-bearing component at Swan Point was found to predate 14,000 cal. BP, but also because two sites in the Tanana valley continue through the terminal Pleistocene to have bifacial points resembling Chindadn points from Nenana complex sites in the Nenana Valley, some 10 Technology and Human Response to Environmental Change… archaeologists argue Nenana complex and Denali complex variability represents different behavioral facies of a pan-Beringian archaeological tradition lasting >4000 years (Holmes 2011; Potter et al. 2014a) and presumably reflects no signifi- cant adaptive change to major climatic fluctuation over this timeframe. Thereby, depending on the situation, people selected different technological strategies, bifa- cial versus composite osseous-microblade hunting weapons, for different immedi- ate needs such as hunting different animals during different seasons, extracting resources in uplands versus lowlands, or proximity to toolstone sources (Holmes 2001; Gal 2002; Potter 2005; Wygal 2009, 2011; Graf and Bigelow 2011). A major issue with this reasoning is that we should expect to find Nenana and Denali com- plex artifacts together at some sites, but we do not observe this pattern. The only exception is the stratigraphically problematic Healy Lake site, where multiple com- ponents may have been excavated together as one (Erlandson et al. 1991; Cook 1996; Hamilton and Goebel 1999). Additionally, faunal data do not support expecta- tions of the related different-animal-during-different-seasons hypothesis. From the Dry Creek site, fauna found in both the Nenana and Denali components indicates hunting activities during the same season (late fall/winter) as well as hunting of the same animal type (Dall sheep) with the different weapon-system technologies (first Chindadn points, then osseous-microblade composite and lanceolate points). At Broken Mammoth, hunters used the same weapon system (Chindadn points) to dis- patch different animal types during different seasons. Clearly, we cannot simply claim that microblade technology was selected only during a specific season and for a specific animal type compared with bifacial technologies. We argue the use of a broad-sweeping “Beringian Tradition” oversimplifies complex patterns observed in the early Beringian record and lumping together varied technological strategies found in stratigraphically and temporally discrete contexts obscures evident vari- ability that needs to be explained. At least three sites in the Nenana Valley contain both Nenana and Denali assem- blages in stratigraphically and chronologically separate geological contexts: Owl Ridge, Dry Creek, and Moose Creek (Pearson 1999; Graf and Bigelow 2011; Graf et al. 2015). Historically, proponents of separating Nenana and Denali complexes have argued this variability resulted from two different populations settling central Alaska from Northeast Asia (Goebel et al. 1991; Hoffecker et al. 1993; Hoffecker and Elias 2007). This interpretation certainly fits well with the recently proposed Beringian standstill model for development of Native American genetic population differentiation hypothetically staged in Beringia or far Northeast Asia (Tamm et al. 2007; Mulligan and Kitchen 2014; Raghavan et al. 2015). The hypothesis of differ- ent Beringian populations with different toolkits is difficult to test without abundant human skeletal remains preserving ancient DNA that would provide population- level genetic information. Recent skeletal finds associated with Denali complex technology at the Upward Sun River site in the Tanana Valley (Potter et al. 2011, 2014b) evidence at least two mtDNA clades present in the same population, giving us important clues about social organization at this time and genetic relatedness of early Holocene Alaskans with other Native Americans (Tackney et al. 2015); A.K. Gore and K.E. Graf however, we need preserved human DNA from earlier Beringian sites with Nenana complex technology to begin to test the different populations hypothesis. What does the chronological patterning of Beringian archaeological variability mean? We are more interested in understanding whether the patterns of variability can be explained as human response to variation in resource distribution resulting from climate change (following Mason et al. 2001; Graf and Goebel 2009; Graf and Bigelow 2011; Wygal 2011). We contend humans will select necessary tool- provisioning strategies to be successful in a given environmental situation and per- ceived landscape. In this paper we consider
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